They require tax returns, voter registration, car registration, driver license, and utility bills in the app to prove it's your primary.

The existing mobile also had utilities hooked up with a $17k impact fee credit that I didn't have to pay to the county.

Quote from @Deandre Brown: When analyzing deals, a few additional factors I like to consider are whether the electric and gas utilities are charged per unit or as a single expense.

Some areas have restrictions on mobile homes or rentals.Utilities: Ensure the land is equipped with essential utilities like water, sewer, and electricity.

3) It's been 5+ years since we've seen a S8 tenant lose their voucher for property damages, not paying their portion of the rent or utilities, or other lease violations (letting others move in with them).It's our opinion that #2 & #3 above are caused by overworked caseworkers not having the time to process the extra required paperwork, so they take the path of least resistance.4) S8 needs someone at the federal level to put more of the program online and streamline the process!

I would say don't be afraid to utilize the equity line again.

If you use different sources it will be difficult to calibrate the different scores, but think of it as a percentage of the max available score.This particular score seems to be based on an applicant's credit history, including payment history, credit utilization, and credit availability. 

Are there investors here in Texas that have utilized and would recommend banks they hold series LLC accounts with? 

Their most common threat is a security deposit dispute.

The most common options used by investors seem to be an LLC or Umbrella Insurance.